Bump Microsoft.SourceLink.GitHub from 1.1.1 to 8.0.0 in /source

Bumps [Microsoft.SourceLink.GitHub](https://github.com/dotnet/sourcelink) from 1.1.1 to 8.0.0.
- [Release notes](https://github.com/dotnet/sourcelink/releases)
- [Commits](dotnet/sourcelink@1.1.1...8.0.0)

---
updated-dependencies:
- dependency-name: Microsoft.SourceLink.GitHub
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

source/Halibut/Halibut.csproj

@@ -34,7 +34,7 @@
     <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
     <PackageReference Include="Newtonsoft.Json.Bson" Version="1.0.2" />
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="All" />
     <PackageReference Include="Nito.AsyncEx.Coordination" Version="5.1.2" />
     <PackageReference Include="System.Runtime.Caching" Version="8.0.0" />
     <PackageReference Include="NetCoreStack.DispatchProxyAsync" Version="2.2.0" />